require('./moudles/a')
// 全部引入
/* const b = require('./moudles/b')

console.log(b); */
// 按需引入
/* const { a,b } = require('./moudles/b')

console.log(a,b);
 */

// 引入默认值
const a = require('./moudles/c')
console.log(a);
/* const fn = () => {
  console.log(222);
}
fn() */